cahuk
Only it is hard to find this offer: https://www.rsync.net/products/zfsintro.html.
rsync.net is not cheap but you have to know what you get: ZFS with great redundancy and a great support. All you have to do is using the service. You don't have to worry about maintenance.
I upgraded the memory to 12 GB. Since then working on my iMac is a lot easier.
But the troubles are still there (from time to time). A few days ago I ran Virtualbox and Parallels Desktop 7. I had a 5 GB big swap, the machine started paging out and it slowed down. I had to quit some apps to solve the problem.
So I have to agree with the author of the article that Lion has a weak memory management. Apple must fix this. Running a 12 GB of RAM machine and getting a sluggish machine?
I think that if I would install an SSD my iMac would be a lot faster. Also the paging out.
I didn't try Bitcasa yet since I got today an invitation.